batgrbproduct analysis for trigger=994723
batgrbproduct Analysis for Trigger=994723
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Sun Sep 6 09:59:03 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994723/GCN5_download_cron
======================================================================
Trigger: 00994723 Segment: 000
BAT Trigger Time: 620991008 [s; MET]
Trigger Stop: 620991072 [s; MET]
UTC: 2020-09-05T09:29:42.418620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.6610057085695 Dec: 22.2191792705523 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.95
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.95
Flight Position: [ source = BAT ]
RA: 83.6610057085695 Dec: 22.2191792705523 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.6821510997596 Dec: 22.2492391986022 [deg; J2000]
{ 05h 34m 43.7s , +22d 14' 57.3" }
+/- 2.45912258156764 [arcmin] (estimated 90% radius based on SNR)
+/- 1.08313206433516 [arcmin] (formal 1-sigma fit error)
SNR: 8.41125855552217
Angular difference between Flight and Ground position is 2.152241 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.131439 0.835790 0.442051 -0.073876
0.108234 0.115627 0.111534 0.126005 [error]
Peak 1.131439 0.835790 0.442051 -0.073876
0.108234 0.115627 0.111534 0.126005 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 3.67e-07 4.25e-07 3.54e-07 4.96e-07 1.32e-06 1.64e-06 erg/cm2
Error 6.64e-08 6.15e-08 1.06e-07 2.90e-07 2.32e-07 4.17e-07 erg/cm2
Peak flux Power-law 1.88e-01 1.21e-01 5.03e-02 2.85e-02 3.73e-01 3.87e-01 ph/cm2/s
Error 3.49e-02 1.69e-02 1.45e-02 1.55e-02 4.93e-02 5.20e-02 ph/cm2/s
Fluence Cutoff-PL 3.69e-07 4.23e-07 3.58e-07 4.55e-07 1.32e-06 1.60e-06 erg/cm2
Error 6.70e-08 6.68e-08 1.07e-07 3.42e-07 2.40e-07 4.83e-07 erg/cm2
Peak flux Cutoff-PL 1.89e-01 1.20e-01 4.97e-02 2.75e-02 3.73e-01 3.87e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- 5.49e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.264 0.309 - - 2.18e-03 4.64e-04 51.040 57
CPL 2.580 -0.590 213.7 0.0 1.49e-03 0.00e+00 50.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.264 0.309 - - 2.18e-03 4.64e-04 51.040 57
CPL 2.580 -0.590 213.7 0.0 1.49e-03 0.00e+00 50.750 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.6822 +22.2492 0.0229 42.0 167.6 2.4865 8.4 TRIG_00994723
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26404 ( -0.291112 0.327344 )
Norm@50keV : 2.17841E-03 ( -0.000472665 0.000455327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.04 using 59 PHA bins.
# Reduced chi-squared = 0.8955 for 57 degrees of freedom
# Null hypothesis probability = 6.969416e-01
Photon flux (15-150 keV) in 64 sec: 0.373229 ( -0.0493249 0.0493249 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32387e-06 ( -2.26898e-07 2.37519e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58014 ( -0.812243 -1.99234 )
Epeak [keV] : 213.681 ( )
Norm@50keV : 1.49383E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.75 using 59 PHA bins.
# Reduced chi-squared = 0.9063 for 56 degrees of freedom
# Null hypothesis probability = 6.731682e-01
Photon flux (15-150 keV) in 64 sec: 0.373280 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31962e-06 ( -2.41197e-07 2.38778e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78673 ( 1.78793 1.78793 )
beta : -2.25978 ( 2.26216 0.289579 )
Epeak [keV] : 6.82376 ( -6.22789 -6.22789 )
Norm@50keV : 6.15677E-03 ( -0.00208764 0.0264545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.9281 for 55 degrees of freedom
# Null hypothesis probability = 6.263825e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.76661 (-1.61223 1.80721)
R^2/D10^2 : 0.270380 (-0.137987 0.330434)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.44 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.248203e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.553e-07 6.774e-08
25- 50 5.205e-07 1.183e-07
50-150 1.831e-07 7.325e-08
15-150 9.588e-07 1.904e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.7995 (-15.3812 27.9314)
Norm : 2.18296 (-0.50779 0.767599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9413 for 57 degrees of freedom
# Null hypothesis probability = 6.013014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.342e-07 6.269e-08
25- 50 4.647e-07 8.371e-08
50-150 4.143e-07 1.778e-07
15-150 1.213e-06 2.704e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.22328 (-0.895643 1.16393)
R1^2/D10^2 : 15.2297 (-11.4956 90.3606)
kT2 [keV] : 13.5953 (-2.94379 4.71266)
R2^2/D10^2 : 3.95428E-02 (-0.0274725 0.0663564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.61 using 59 PHA bins.
# Reduced chi-squared = 0.8839 for 55 degrees of freedom
# Null hypothesis probability = 7.157021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.798e-07 2.052e-07
25- 50 4.098e-07 2.130e-07
50-150 4.287e-07 2.667e-07
15-150 1.218e-06 5.522e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26404 ( -0.291112 0.327344 )
Norm@50keV : 2.17841E-03 ( -0.000472665 0.000455327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.04 using 59 PHA bins.
# Reduced chi-squared = 0.8955 for 57 degrees of freedom
# Null hypothesis probability = 6.969416e-01
Photon flux (15-150 keV) in 64 sec: 0.373229 ( -0.0493249 0.0493249 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32387e-06 ( -2.26898e-07 2.37519e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58014 ( -0.812243 -1.99234 )
Epeak [keV] : 213.681 ( )
Norm@50keV : 1.49383E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.75 using 59 PHA bins.
# Reduced chi-squared = 0.9063 for 56 degrees of freedom
# Null hypothesis probability = 6.731682e-01
Photon flux (15-150 keV) in 64 sec: 0.373280 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31962e-06 ( -2.41197e-07 2.38778e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78673 ( 1.78793 1.78793 )
beta : -2.25978 ( 2.26216 0.289579 )
Epeak [keV] : 6.82376 ( -6.22789 -6.22789 )
Norm@50keV : 6.15677E-03 ( -0.00208764 0.0220684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.9281 for 55 degrees of freedom
# Null hypothesis probability = 6.263825e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.76661 (-1.61223 1.80721)
R^2/D10^2 : 0.270380 (-0.137987 0.330434)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.44 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.248203e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.553e-07 6.675e-08
25- 50 5.205e-07 1.146e-07
50-150 1.831e-07 6.861e-08
15-150 9.588e-07 1.936e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.7995 (-15.3812 27.9314)
Norm : 2.18296 (-0.50779 0.767599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9413 for 57 degrees of freedom
# Null hypothesis probability = 6.013014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.342e-07 5.424e-08
25- 50 4.647e-07 8.637e-08
50-150 4.143e-07 1.822e-07
15-150 1.213e-06 2.502e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.22328 (-0.895643 1.16393)
R1^2/D10^2 : 15.2297 (-11.4956 90.3606)
kT2 [keV] : 13.5953 (-2.94379 4.71266)
R2^2/D10^2 : 3.95428E-02 (-0.0274725 0.0663564)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.61 using 59 PHA bins.
# Reduced chi-squared = 0.8839 for 55 degrees of freedom
# Null hypothesis probability = 7.157021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.798e-07 1.976e-07
25- 50 4.098e-07 2.044e-07
50-150 4.287e-07 2.527e-07
15-150 1.218e-06 6.410e-07
Plot creation:
Sun Sep 6 10:03:41 EDT 2020